tamerlan went back to his house. and you would not have known they had just conducted one of the most significant terrorist attacks on u.s. soil. so the psychological profile here is something that's also going to get a tremendous amount of attention. >> we have from pete williams the breaking news that he is, the suspect they currently have is cooperating, saying they acted alone, they did not have any foreign assistance, they didn't seek any foreign guidance, got instructions for bomb making on the internet. do the facts as you know them now synch with that? >> yeah, from what we know i think that is all part and parcel of the story, and i think also we would have heard pre-miranda whether or not during the public safety exception if he had provided any information about imminent threat, additional plans, additional co-conspirators. because we haven't heard from any government sources on it, we should conclude there was nothing else in terms of imminent threat. the next step is to get all of the statements from tsa